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489
FXUS65 KBOI 010325
AFDBOI

AREA FORECAST DISCUSSION
NATIONAL WEATHER SERVICE BOISE ID
825 PM MST SAT JAN 31 2015

.DISCUSSION...HIGH CLOUDS ROLLING OVER THE UPPER RIDGE HAVE PUSHED
INTO SE OREGON AND ARE INCREASING ACROSS SW IDAHO. IR SATELLITE
PICS ALSO SHOWING STRATUS DECK OVER THE WESTERN MAGIC VALLEY
RETREATING EASTWARD THIS EVENING. THE CLEARING IS EXPECTED TO BE
TEMPORARY OVER GOODING AND JEROME COUNTIES AS THE CLOUD SHIELD
BUILDS BACK OVERNIGHT. THE SW DRAINAGE WINDS IN TWIN FALLS WILL BE
ENOUGH TO KEEP SKIES CLEAR. ELSEWHERE HIGH CLOUDS ARE RELATIVELY
THIN BUT ENOUGH TO SLOW REDEVELOPMENT OF FOG OVERNIGHT. AREAS
WITH THE HIGHEST PROBABILITY OF FOG REDEVELOPMENT ARE THE HARNEY
VALLEY...WEISER VALLEY AND MTN VALLEYS IN THE WEST CENTRAL MTNS.
MADE MINOR UPDATES FOR FOG AND SKY COVER OVERNIGHT.

&&

.AVIATION...VFR THROUGH SUNDAY MORNING EXCEPT FOR PATCHY MVFR/IFR
VALLEY STRATUS AND FOG. SNOW...WITH RAIN BELOW 4500 FT MSL...WILL
SPREAD EAST AND SOUTH AS FAR AS KBNO AND KBKE BY 18Z...AND THE
NEVADA BORDER BY 00Z. VALLEYS SHOULD REMAIN MOSTLY VFR...BUT EXPECT
AREAS OF MOUNTAIN OBSCURATION. SURFACE WINDS...VARIABLE 10 KTS OR
LESS. WINDS ALOFT...NORTHWEST UP TO 25 KT AT 10K FT MSL.

&&

.PREV DISCUSSION...
SHORT TERM...FIRST TROUGH IN THE NORTH PACIFIC WILL COME INLAND
BEGINNING SUNDAY BUT WILL HAVE TO MOVE THROUGH THE EVER-PRESENT
LONG WAVE RIDGE OVER WRN NORTH AMERICA.  PCPN WILL BEGIN IN OUR
NRN ZONES SUNDAY AFTERNOON WITH BULK OF IT SUNDAY EVENING IN
IDAHO ZONES NORTH OF THE SNAKE BASIN.  AFTER A SHORT BREAK MONDAY
MORNING A WETTER PACIFIC TROUGH WILL BRING MORE PCPN MONDAY
AFTERNOON TO ALL ZONES.  TEMPS TONIGHT AND SUNDAY WILL CHANGE
LITTLE FROM PREVIOUS DAYS...BUT SUNDAY NIGHT WILL BE MILDER AND
MONDAY A LITTLE COOLER DUE TO CLOUDS AND PCPN.  POPS WILL BE CLOSE
TO MET MOS...AS MAV MOS CONTINUES TO SHOW A DRY BIAS.  PATCHY FOG
AGAIN IN THE VALLEYS TONIGHT AND SUNDAY MORNING.

LONG TERM...MONDAY NIGHT THROUGH SATURDAY. MOIST WESTERLY FLOW WILL
BRING SEVERAL ROUNDS OF LIGHT PRECIPITATION TO SOUTHEAST OREGON AND
SOUTHWEST IDAHO THROUGH WEDNESDAY. AN EXITING SHORT WAVE WILL KEEP
SHOWERS ACROSS SW IDAHO MONDAY NIGHT THROUGH TUESDAY. UPPER RIDGE
REBUILDS NORTH ACROSS THE AREA ON WEDNESDAY PUSHING THE MOISTURE TOP
OUT OF THE REGION. SNOW LEVELS WILL BE HIGH ENOUGH FOR BOTH RAIN AND
SNOW ACROSS MOUNTAIN VALLEYS...INCLUDING THE LONG VALLEY AND CAMAS
PRAIRIE. DRIER THURSDAY WITH A PACIFIC RIDGE OVER THE AREA. RIDGE
WILL SHIFT EASTWARD ON FRIDAY...ALLOWING SOUTHWESTERLY FLOW ON THE
BACK SIDE OF THE RIDGE TO TRANSPORT LOW-LEVEL MOISTURE NORTHEAST
INTO THE AREA. EXPECT WET CONDITIONS FRIDAY NIGHT THROUGH EARLY
SUNDAY.

&&

.BOI WATCHES/WARNINGS/ADVISORIES...
ID...NONE.
OR...NONE.

&&

$$

WEATHER.GOV/BOISE

DISCUSSION...DG
AVIATION.....JT
PREV SHORT TERM...LC
PREV LONG TERM....JDS




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